Scavenging attachment for internal combustion engines



June 26, 1962 c. MOCLELLAN PHILLIPS SCAVENGING ATTACHMENT FOR INTERNAL COMBUSTION ENGINES Filed Jan. 9, 1961 ilnited States Eatent 3,040,722 SCAVENGING ATTACHMENT FOR INTERNAL CONEBUSTEGN ENGENES Curtis M'cClellan Phillips, Rudyard, Mont. Filed Jan. 9, 1961, Ser. No. 81,310 4 Claims. (Cl. 123-75) This invention relates to attachments for scavenging carbon monoxide from the compression chamber of an internal combustion engine.

In a previous application, filed April 25, 1960, Serial Number 24,455, now Patent No. 3,006,325, for an Anti- Smog Attachment for Internal Combustion Engines, there was disclosed a device by which swirling air may be injected downward against the head of a piston in an internal combustion engine during exhaust stroke to aid in discharge of carbon monoxide remaining after exhaust stroke in the compression chamber. This leaves oxygen in the com ression chamber.

The present invention is concerned with improvements on the above device, these having reference to an im proved pipe through which the air is injected and means for connection of valve control means for the pipe to be actuated by the rocker arm of the engine exhaust valve. In addition there is included a compression valve in the lower end of the air intake pipe.

Other features and advantages of the invention will become apparent by reference to the accompanying description taken in conjunction with the drawings.

In the drawings, wherein is illustrated a preferred embodiment of the invention,

FIG. 1 is an enlarged side view of a fragment of an engine cylinder in which my air injection attachment is mounted, and including the engine exhaust rocker arm and connection for actuation of the air inlet control valve, illustrated with the compression valve ball seated, and shown in part broken away and with the attachment largely in vertical section.

FIG. 2 is a detail side view of a fragment of the cylinder, including the lower end portion of the air inlet pipe and the compression valve with the valve ball unseated, shown partly in vertical section.

FIG. 3 is an upper end view of the air inlet valve and actuating arm for the valve.

FIG. 4 is a side view in vertical section of the air inlet valve body.

Having reference to the drawings, at 1 is indicated a fragment of the cylinder head and including the water jacket 2, the exhaust valve 3 with valve stem 4.

Mounted in the cylinder head is an air inlet pipe 5, normally about one quarter inch in diameter, but varying to accommodate cylinders of different sizes.

On the upper end of this pipe is threaded a valve body 6 having an air inlet bore 7 discharging into the air inlet pipe and to which would be connected an air inlet tube 8 leading from a source of supply of air under pressure. The valve body also has a transverse bore 9 forming a seat for a rotary valve 14} with air passage 11 and secured by a nut 12 threaded thereon and to which valve an arm 13 attaches, the arm having a suitable opening at 14 engageable on the valve stem 4 and held by dish faced washers 15 and cotter pins 16, by which endwise movement of the valve stem will turn the valve 11 to open and close the air inlet bore 7.

Within the air inlet pipe is mounted a spiral formed of a flat piece of material 17 having a diameter corresponding to the gauge of the pipe to provide a series of spirals 18.

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By the use of these spirals air under'pressure injected into the pipe discharges into the cylinder as a swirling stream. In the present showing four spirals are used, but the number may be varied as required according to the engine on which it is to be used and the consequent size of air stream required,

On the lower end of the air inlet pipe 5 is threaded a block 19 in which is threaded a cage 20 carrying a valve ball 21 adapted to seat against the lower end of the air inlet pipe. Screws 22 secure the cage against displacement.

In the use of the device the valve ball 21 is normally held by pressure in the cylinder seated against the lower end of the air inlet pipe 5. Additionally the pipe 5 is closed by the valve 10 and this valve is partly turned by the arm 13 actuated by the stem 4 of the exhaust valve 3 when the exhaust valve opens, so that release of pressure within the cylinder by opening of the exhaust valve allows the ball 21 to be unseated and at the same time the valve 10' is turned to bring the opening 11 therein into register with the air inlet bore 7.

Closing of the exhaust valve 3 turns the valve body 10 to move the opening 11 therein out of register with the inlet bore 7, and pressure in the cylinder seats the valve 21.

While I have herein disclosed a preferred embodiment of the invention changes within the spirit and scope thereof will be considered a part of the invention. I

What I claim and wish to secure by Letters Patent is:

1. In an attachment for injection of a swirling stream of air under pressure downward into the combustion chamber of a cylinder of an internal combustion engine, an air inlet pipe, means mounting said pipe upstanding in the cylinder head discharging into the combustion chamher, and a spiral insert in the pipe consisting of a flat piece of material twisted to form a series of successive spirals.

2. An attachment as set out in claim 1 and including means controlling injection of air into the air inlet pipe, the engine including an exhaust valve and upstanding stem thereon, said means comprising a valve body mounted on the air inlet pipe, said body having a bore registering with said pipe, a rotary valve transversely mounted in said body, said valve having an opening therethrough for register with the air inlet bore, and an arm attaching said rotary valve to be turned by endwise movement of the exhaust valve stem.

3. An attachment as set out in claim 1 and including a ball valve cage and means attaching said cage on the lower end of the air inlet pipe, and a ball valve in the cage.

4. In an attachment for injection of a swirling stream of air under pressure downward through the cylinder head of an internal combustion engine, said engine including an exhaust valve for the cylinder and a stem for the valve,

valve control means for the air inlet pipe and means connecting said valve control means to be actuated by the exhaust valve stem, means in the air inlet pipe causing the air passing therethrough to swirl on discharge from the pipe, and valve control means for the air inlet pipe lower end normally closed by pressure within the cylinder and free to open on release of said pressure.

References Cited in the file of this patent UNITED STATES PATENTS 1,503,383 Sargent July 29, 1924 1,511,281 Kennedy Oct. 14, 1924 2,144,561 Buchi Jan. 17, 1939 

